Gooch and Perkins — Determination of Free Iodine. 37 



of iodine in one "hour, and that crystalline electrolytic sil- 

 ver took up 0*0051 grm in one hour and forty-live minutes. 



This action of air once shown, the next step was to investigate 

 the behavior of silver in contact with potassium iodide pro- 

 tected from the action of the air. In Table III are recorded 



Table III. 



The Action of Silver upon N/10 Iodine in an Atmosphere of 



Hydrogen. m 



Increase in 



weight of 



iodine 



grm. 



(A) 



The action of silver reduced from AgCl by zinc and treated with KI. 



3-0000 0-6461 0-6464 +0*0003 



1-0000 0-6447 0-6448 +0-0001 +0*0002 



(B) 



Silver 



Iodine 



taken 



taken 



grm. 



grm. 



Error in 



error in 



iodine 



iodine 



grm. 



grm. 



The action of silver reduced from Agl by 



zinc and treated with KI. 



3-6293 



0-3217 



0-3221 



+ 0-0004 



3-2049 



0-3217 



0-3225 



+ 0-0008 



3-0000 



0-3217 



0-3219 



+ 0-0002 



3-0068 



0-3217 



0-3212 



— 0-0005 



3-0049 



0-3217 



0-3221 



+ 0-0004 



3-0026 



0-6434 



0-6441 



+ 0-0007 



2-9990 



0-3217 



0-3214 



— 0-0003 



3-0005 



0-3217 



0-3214 



— 0-0003 +0-0002 



(C) 

 The action of silver reduced from Ag 2 S by hydrogen and treated with KI. 



3-0000 0-6461 0-6463 +0*0002 



3-0000 0-6461 0-6460 —0-0001 +0'0001 



0>) 

 The action of silver reduced from Ag 2 by hydrogen. 



3-0000 



0-6434 



0-6443 



+ 0-0009 





3-0000 



0-6434 



0-6430 



(E) 



— 0-0004 



+ 0*0003 





The action of silver reduced electrolytically from AgNO 



3- 



4*4189 



0-6447 



0-6447 



±0-0000 





3-0025 



0-6447 



0-6448 



+ 0-0001 





3-0009 



0-6447 



0-6443 



-0-0004 





3-0157 



0-6447 



0-6445 



— 0-0002 





3-0000 



0-6447 



0-6444 



— 0-0003 





3-0000 



0-6447 



0-6452 



+ 0-0005 





3-0004 



0-6447 



0-6443 



— 0-0004 





3-0043 



0-6447 



0-6443 



— 0-0004 





3-0000 



0-6434 



0-6430 



— 0-0004 





3-5810 



0-3217 



0-3221 



+ 0-0004 





3-0000 



0-3217 



0-3219 



+ 0-0002 



—o-oooi 



